Hey Don,
Like so many things audio, there are pluses and minuses to everything, but I'm not a reviewer, so maybe can't articulate this as well as I'd like. The Thor amps are more pure, cleaner sounding, quieter background, faster(?) They aren't strident or sibilant, they are very smooth and clean sounding, quieter background. But to me the Audio Alchemy amps, are richer, have more dimensionality, more warmth.
So, they are staying, but in rotation. I go back and forth every few weeks or so, and always marvel at, and enjoy, the change
Maybe if I were to start looking at different pre-amps, or cables, I would stop swapping, but we all know the rabbit hole
